JP2022521629A - Track cutting device and tube adjustment device - Google Patents

Abstract

SOLUTION:
The device that cuts and adjusts the tube (T) in an annular shape is
A rotor (18) having an opening hole (20) in which the tube (T) to be cut is moved along the long axis of the tube (T) through the opening hole (20). The rotor (18) can be driven to rotate about a first rotation axis (x1) that coincides with the major axis of the tube (T) supplied to the device (14) during use. )When,
A cutting device (22, 24) including a first support (22) mounted on the rotor (18) and a cutting tool (24) carried by the first support (22) so as to be radially movable. )When,
It has a second support (34) mounted on the rotor (18) and movable radially on the rotor (18), and an adjustment tool (36) carried by the second support (34). ..
[Selection diagram] FIG. 9

Description

The present invention relates to a tube trajectory cutting device and a device that adjusts the tube after cutting.

A so-called orbital cutting method for cutting a tube having a circular cross section, for example, a tube that is bent by a bending machine or whose tube end is deformed by a tube end molding machine is known.

Orbital cutting of a tube with a circular cross section is a gradual cut into the tube by swirling a circular cutter, commonly known as a cutting roller, around the tube to separate the tube piece from the original tube bar or tube coil. It is a process that does not remove chips, which is performed by inserting. The tube piece is then separated from the tube bar or tube coil by any of the following known methods. A through cut in which a cutting roller gradually makes a cut so as to completely penetrate the pipe by its thickness. Cuts and breaks where the cutting roller makes a gradual cut in the tube without completely penetrating the thickness of the tube and pulls the tube during or shortly after the cutting roller is advancing to separate the tube pieces. Cutting rollers gradually form grooves in the tube without completely penetrating the thickness of the tube, and the tube pieces are separated by bending the tube, notches and snaps.

FIG. 1 of the accompanying drawing shows a known example of a line for supplying and cutting a tube. This line consists of a supply unit 10 that supplies the rod-shaped tube T (probably a tube resulting from a bent and straightened tube coil), a clamp unit 12 that clamps the tube T, and a cutting unit that swivels and cuts the tube T. It has a breaking unit 16 that breaks a part of the tube T after being cut by the cutting unit 14. If the tube pieces are separated by the through-cut method described above, the breaking unit 16 is not provided or used.

The cutting unit 14 is specifically shown in FIGS. 2 and 3 of the accompanying drawings, with FIG. 3 showing an enlarged view of detail A in FIG.

Referring to FIGS. 2 and 3, the cutting unit 14 includes a rotor 18 having a central hole 20. A tube T to be cut is sent through the hole 20 in the center. The rotor 18 is attached with a support 22 that carries the cutting roller 24. The rotor 18 is driven by, for example, a gear motor unit having an electric motor 26, and rotates about a first rotation axis x1 corresponding to the long axis of the tube T. The support 22 is movable with respect to the rotor 18 in the radial direction (indicated by the reference numeral y). The cutting roller 24 can freely rotate about the second rotation axis x2 parallel to the first rotation axis x1 with respect to the support 22.

Referring to FIGS. 4-7 of the accompanying drawings, as shown in FIGS. 2 and 3, the process of cutting the tube T by the cutting unit is performed (for simplicity of explanation, from the tube bar supplied by the supply unit 10. Considering the penetrating cutting technique for separating the tube pieces, the procedure is as follows).

First (FIG. 4), the tube T is moved axially (ie, the longitudinal direction of the tube that coincides with the rotation axis x1 of the rotor 18) until the cross section of the tube T to be cut is positioned on the cutting roller 24. To.

At this point (FIG. 5), the cutting roller 24 comes into contact with the surface of the tube T and the support 22 moves radially toward the major axis of the tube T. Further, the rotor 18 is driven to rotate about the first rotation axis x1, and the cutting roller 24 rotates around the tube T.

As shown in FIG. 6, during the rotational operation of the rotor 18, the support 22 and the cutting roller 24 carried by the support 22 are radially moved toward the long axis of the tube T. As a result, the cutting roller 24 forms a circumferential groove C gradually deepening in the thickness direction of the tube until the tube piece (indicated by reference numeral P) is separated.

Finally, as shown in FIG. 7, the rotation of the rotor 18 is interrupted and the cutting roller 24 is returned to the radial start position away from the surface of the tube T.

The orbital cutting process has the disadvantage that pushing the cutting roller from the outside to the inside of the tube causes the material to move radially toward the inside of the tube, resulting in a reduction in the inner diameter of the tube. In addition to the fact that the inner diameter of the tube becomes smaller as the outer diameter of the tube becomes smaller, it must be taken into consideration that the inner diameter of the tube decreases due to the generation of burrs.

The decrease in the inner diameter of the tube affects the subsequent processing of the tube (especially the bending of the tube with the core) (in particular, the decrease in the inner diameter of the tube in the area around the cut is greater than the inner diameter of the tube. A core with a small diameter must be used, which risks bending defects) and is an undesired cutting effect as it affects the function of the finished product.

The decrease in tube inner diameter as a result of orbital cutting is due to tool dimensions (size, rake angle, sharpness, etc., but the latter tends to decrease with use), cutting parameters (eg, penetration speed), And are closely related to a number of factors linked to the metallurgical properties of the tubes being machined.

Due to these various factors, it is not always possible to keep the decrease in the inner diameter of the tube within an allowable range during work.

Therefore, it is known that after orbital cutting, a special unit arranged on the downstream side of the cutting unit performs an adjustment process on the cut tube piece in order to return the inner diameter of the tube to the nominal value. This adjustment process includes, for example, a trimming process and a deburring process.

However, this solution requires a special treatment unit because the tube must be handled properly between the cutting unit and the conditioning unit and the waste generated during the conditioning process must be handled properly. It is not optimal because it needs to be provided, which increases the cost, size, and complexity of the factory. In addition, performing such an additional process increases the cycle time and results in a decrease in the productivity of the tube processing plant (for example, bending process).

It also adjusts according to so-called "push" techniques (ie, pushes the tube inward by a predetermined distance (eg, a few millimeters) using a special punch placed coaxially with the tube) to create an inner diameter of the tube. Is known to increase. However, while adjusting solves the problem of adjustment, push adjustment has the disadvantage of moving burrs inside the tube, which causes problems in the subsequent tube processing process and the final specification stage of the tube.

Therefore, it is an object of the present invention to provide a tube trajectory cutting device that is not affected by the conventional drawbacks described above, as well as a device for post-cutting adjustment.

This and other objectives are fully achieved by the invention of the apparatus having the features according to claim 1 of the appended claims.

The advantages of the present invention are described in the dependent claims. Its content is understood as an integral part of the following description.
In short, the present invention is based on the idea of creating a device for cutting and adjusting a tube, with a rotor having a central hole in which the tube to be cut is moved and driven to rotate around a first axis of rotation. ,
A first support provided radially movably on the rotor, and a cutting device including a cutting tool carried by the first support.
It has an adjustment device including a second support provided radially movably on the rotor and an adjustment tool carried by the second support.
The adjustment tool can be moved radially outward to increase the inner diameter of the tube piece.

This device has a cutting device and an adjusting device mounted on the same rotor. There is no need to provide an additional processing unit downstream of the cutting unit to adjust the tube after cutting. Therefore, all the above-mentioned drawbacks related to the existence of additional units are eliminated. Also, the adjustment tool is provided on a support that is radially movable with respect to the tube to be machined again with respect to the rotor. Therefore, the adjustment of the tube is performed by means of moving the tool radially with respect to the tube, not by means of moving the tool axially along the long axis of the tube, as in push adjustment. Therefore, the problem of moving burrs inside the tube, which is typical of push adjustment, is solved.

Preferably, the first support and the second support are separate and are provided on the rotor so that they move in the same radial direction. However, instead of this, one support may be provided to perform the functions of both the cutting tool and the adjusting tool.

According to one embodiment, in order to move the first support and the second support (and the cutting and adjusting tools) radially with respect to the rotor (tube), the device is with the first support. It has one drive that is paired with both of the second supports and controls the radial movement of those supports symmetrically with respect to the rotor axis of rotation (ie, the major axis of the tube). Alternatively, a first drive device and a second drive device may be provided. Each of these drive devices is paired with a corresponding support, and the radial movements of the first support and the second support are driven independently of each other.

Preferably, the cutting tool is formed by rollers. The roller is rotatably provided on the first support about a second axis of rotation parallel to the first axis of rotation and has a circumferential cutting edge.

As far as the adjustment tool is concerned, the tube may be configured to expand by plastic deformation or tip removal. In this other form, the adjustment tool is provided with a cutting edge shaped appropriately for machining the end of the tube.

A further subject of the invention according to claim 9 is a machine for processing a tube, such as a machine for straightening and cutting a tube from a coil, comprising a device for cutting and adjusting the tube, which has the above-mentioned characteristics. ..

According to one embodiment, the machine is configured to perform the following steps:
The process of cutting a tube piece out of a tube by means of a cutting tool using a rotating rotor.
A step of axially moving and separating the tube piece from the rest of the tube.
The step of moving the adjustment tool radially toward the long axis of the tube until it reaches a predetermined position within the radial dimension of the tube.
A step of moving the tube piece in the axial direction with respect to the adjustment tool.
A step of moving the adjustment tool radially outward while rotating the rotor to expand the inner diameter of the tube piece.

Further features and advantages of the present invention will be further demonstrated from the following detailed description provided as non-limiting examples with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a conventional tube supply and cutting line. FIG. 2 is a perspective view showing a cutting unit of the supply and cutting lines in FIG. FIG. 3 shows an enlarged view of detail A in FIG. FIG. 4 sequentially shows the steps in the process of cutting a tube using the cutting unit of FIGS. 2 and 3. FIG. 5 sequentially shows the steps in the process of cutting a tube using the cutting unit of FIGS. 2 and 3. FIG. 6 sequentially shows the steps in the process of cutting a tube using the cutting unit of FIGS. 2 and 3. FIG. 7 sequentially shows the steps in the process of cutting a tube using the cutting unit of FIGS. 2 and 3. FIG. 8 is a perspective view of an apparatus for cutting a tube and adjusting the tube after cutting according to the embodiment of the present invention. FIG. 9 is a perspective view showing in detail the cutting device and the adjusting device of the device of FIG. FIG. 10 sequentially shows a plurality of steps in the process of adjusting a tube using the device of FIG. FIG. 11 sequentially shows a plurality of steps in the process of adjusting a tube using the apparatus of FIG. FIG. 12 sequentially shows a plurality of steps in the process of adjusting a tube using the device of FIG. FIG. 13 sequentially shows a plurality of steps in the process of adjusting a tube using the device of FIG. FIG. 14 sequentially shows a plurality of steps in the process of adjusting a tube using the device of FIG. FIG. 15 sequentially shows a plurality of steps in the process of adjusting a tube using the device of FIG. FIG. 16 sequentially shows a plurality of steps in the process of adjusting a tube using the device of FIG.

First, referring to FIGS. 8 and 9, parts and elements having the same or corresponding codes as those of FIGS. 1 to 7 (conventional art) are assigned the same reference numerals, and the tube T is cut and the tube is tubed. An adjusting device (hereinafter, simply referred to as "device" for convenience) configured to adjust the cut tube piece P in order to return the inner diameter of the piece P to the initial value (nominal diameter) is a schematic reference numeral. It is shown by 14.

The device 14 has a rotor 18 with a central hole 20. The tube T cut through the hole 20 is on the long axis of the tube by a supply unit (not shown here, but itself is known; see, for example, the supply unit 10 in FIG. 1). Moved along. The rotor 18 is supported so as to rotate about a first rotation axis x1 corresponding to the long axis of the tube T. The device 14 also has a first drive device 26 (eg, an electric gear motor) to drive the rotor 18 to rotate about the first rotary shaft x1.

The rotor 18 is fitted with a support 22 that carries a cutting tool 24 configured, for example, as a roller with sharp peripheral edges. The cutting tool 24 can freely rotate about the second rotation axis x2 parallel to the first rotation axis x1 with respect to the support 22.

The support 22 is movable with respect to the rotor 18 along the radial direction y. In this regard, the support 22 is firmly coupled, for example, to a slider 28 slidably provided in the slot 30 of the rotor 18 extending along the radial direction y. The second drive device 32 (for example, an electric gear motor) is paired with the support 22 rather than paired with the slider 28 in order to move the slider 28 and the support 22 along the radial direction y.

According to the present invention, the device 14 has an adjustment device including a support 34 and an adjustment tool 36 supported by the support 34, in addition to the cutting device formed by the cutting tool 24 and its support 22.

The support 34 is preferably provided on the rotor 18 so as to be radially movable along the same direction as the support 22 that supports the cutting tool 24 moves. Preferably, the support 34 is firmly attached to a slider 38 slidably provided in the slot 40 of the rotor 18 extending radially y on the opposite side of the slot 30 with respect to the rotation axis x1 of the rotor 18. Is linked to.

The support 34, or slider 38, is also paired with a drive that moves the slider 38 and the support 34 along the radial direction y. Preferably, the slider 38 is driven by the same drive 32 that drives the slider 28, with the two sliders 28 and 38 and their associated supports 22 and 34 together with the sliders relative to the axis of rotation of the rotor 18. (Ie, it is moved exactly symmetrically with respect to the long axis of the tube T).

The tube T is cut using the cutting tool 24 as described above with reference to the prior art (see FIGS. 4-7 and related description).

With reference to FIGS. 10 to 16, a method of performing a process of adjusting a cut piece of a tube using the apparatus according to the present invention will be described. The treatment acts to return the inner diameter of the tube piece in the cutting region to the initial value (nominal diameter) as described above in order to compensate for the effect of the decrease in the inner diameter of the tube resulting from the cutting treatment.

The adjustment tool 36 is in the general start position (FIG. 10). After axially moving the newly cut tube piece P from the rest of the tube bar T (if necessary, by a special breaking unit) so as to extend beyond the axial magnitude of the cutting and adjusting devices. , The tube T is turned back by a supply unit (not shown).

At this point, as shown in FIG. 13, the adjustment tool 36 is radially moved towards the major axis of the tube until it reaches a predetermined position. In the illustrated embodiment, only one drive unit is provided in both the cutting device and the adjusting device. As a result, the cutting tool 24 is radially moved toward the long axis of the tube. However, if the two tools move separately, they may be stationary in the starting position so that they do not get in the way during the adjustment process.

The tube piece P is then axially moved towards the adjustment tool 36 until it reaches a position in which it can be used to operate the adjustment tool (FIG. 14).

At this time, the rotor 18 is rotated (in the above-mentioned previous step, the rotor can maintain the rotation without interruption, but it rotates at a speed different from the speed used during the actual adjustment process. Is possible.). Also, in order to increase the inner diameter of the tube piece P (FIG. 15), at the same time, the adjustment tool 36 is appropriately moved outward in the radial direction to a predetermined position (or with a predetermined force). To. As described above, the adjusting tool 36 may be arranged so as to make adjustments by plastic deformation of the tube, or may be arranged so as to make adjustments by removing the tip, as in the embodiment shown here.

Finally, as shown in FIG. 16, when the adjustment process is complete, the newly processed tube piece is removed and the adjustment tool 36 moves out of the radial dimension of the tube T until it reaches the disclosure position. Will be done.

As is clear from the above description, according to the apparatus according to the present invention, the adjustment process can be performed immediately after cutting the tube, so that the cycle time can be minimized. In fact, there is no need to move the newly cut tube pieces to another workstation just to adjust the tubes. In addition, the adjustment tool and cutting tool are integrated into the same device, which simplifies the equipment and reduces manufacturing costs and space required.

Of course, without departing from the scope of the invention described in the claims, without changing the principle of the present invention, the examples and details are changed with respect to the examples described and described only as non-limiting examples. May be.

Claims (10)

A device that cuts and adjusts the tube (T) in an annular shape.
A rotor (18) having an opening hole (20) in which the tube (T) to be cut is moved along the long axis of the tube (T) through the opening hole (20). The rotor (18) can be driven to rotate about a first rotation axis (x1) that coincides with the major axis of the tube (T) supplied to the device (14) during use. )When,
A cutting device (22,) including a first support (22) mounted on the rotor (18) so as to be movable in the front radial direction and a cutting tool (24) carried by the first support (22). 24) and
It has a second support (34) mounted on the rotor (18) and movable radially on the rotor (18), and an adjustment tool (36) carried by the second support (34). death,
The device is characterized in that the adjustment tool (36) is moved outward in the radial direction to increase the inner diameter of the tube piece. A claim that the first support (22) and the second support (34) are separated from each other and provided on the rotor (18) so as to be movable along the same radial direction (y). 1 device. The first support is paired with both the first support (22) and the second support (34), and is symmetrical with respect to the first rotation axis (x1) along the radial direction (y). The device according to claim 2, further comprising one drive device (32) for moving one support (22) and the second support (34). Separately from the first drive device that moves the first support (22) in pairs with the first support (22) along the radial direction (y), and the first support (22). 2. The device of claim 2, comprising a second drive device paired with the second support (34) to move the second support (34) along the radial direction (y). The apparatus of claim 1, wherein the first support (22) and the second support (34) are formed by one support carrying the cutting tool (24) and the adjusting tool (36). The cutting tool (24) is formed by a roller provided on the first support (22) so as to be rotatable around a second rotation axis (x2) parallel to the first rotation axis (x1). The apparatus according to any one of claims 1 to 5, which has a cutting edge in a direction. The device according to any one of claims 1 to 6, wherein the adjustment tool (36) is adjusted so as to enlarge a tube piece (T) of the tube (T) by a composition modification. The device according to any one of claims 1 to 6, wherein the adjusting tool (36) has a cutting edge having a shape that expands the tube piece (P) of the tube (T) by removing a tip. A tube processing machine for straightening and cutting a tube from a coil, comprising a device for cutting and adjusting the tube according to any one of claims 1 to 8. The machine is
A step of cutting a tube piece (P) from the tube (T) by the cutting tool (24) while rotating the rotor (18).
A step of moving the tube piece (P) in the axial direction to move the tube piece (P) away from the remainder of the tube (T).
A step of moving the adjustment tool (36) radially toward the long axis of the tube (T) until the adjustment tool reaches a predetermined position in the radial direction of the tube (T).
A step of moving the tube piece (P) axially toward the adjustment tool (36), and
A machine having a step of moving the adjusting tool (36) radially outward while rotating the rotor (18) to increase the inner diameter of the tube piece (P).

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